code: def test_cupy_ndarray(self, dtype):
      arr = cupy.array([[-1, 1]]).astype(dtype)
      for v in (arr, (arr, arr)):
          assert cupy.min_scalar_type(v) is arr.dtype
  
imports: import unittest
  import sys
  import numpy
  import pytest
  import cupy
  from cupy._core import core
  from cupy import testing
  from cupy_tests.core_tests import test_raw
label_desc: Use image node_id 5 for calling the TestMinScalarType obj's underlying member method code with example usage: obj.test_cupy_ndarray(dtype) without return types